<script lang="ts" setup name="XtxCarousel">
// 坑：script中如果不写东西，name 不起作用！

// （js的defineprops 对象的写法）
import { BannerItem } from '@/types/data'
import { time } from 'console'
import { PropType } from 'vue'
import { ref, onMounted, onUnmounted } from 'vue'
// 1.const props = defineProps({
//   slides: {
//     type: Array as PropType<BannerItem[]>,
//     required: true,
//   },
// })
// autoplay:{
// type:Boolean
// default: false
// }
// duration:{
// type" number
// dafault:3000
//}
// 2.definrProps<props类型>()
const {
  slides,
  autoplay = false,
  duration = 3000,
} = defineProps<{
  // 图片
  slides: BannerItem[]
  // 是否自动轮播的
  autoplay?: boolean
  // 切换时间
  duration?: number
}>()

// 控制高亮的小标
const active = ref(0)
const onPrev = () => {
  active.value--
  if (active.value <= -1) {
    active.value = slides.length - 1
  }
}
const onNext = () => {
  active.value++
  // 如果active.value溢出了下标的最大值，归0

  if (active.value > slides.length - 1) {
    active.value = 0
  }
}
// 定时器逻辑，控制轮播
let timer: number = -1
onMounted(() => {
  play()
})
onUnmounted(() => {
  stop
})
// 播放 开新的 旧的先清理
const play = () => {
  // 如果不希望出现进入页面轮播
  if (!autoplay) return
  // 在模块化环境 编写代码对这种定时器 延时器 编辑器 会识别为node 的语法
  // 我们要的是浏览器端的
  clearInterval(timer)
  timer = window.setInterval(() => {
    onNext()
  }, duration)
}
// 暂停
const stop = () => {
  clearInterval(timer)
}
</script>

<template>
  <div class="xtx-carousel" @mouseenter="stop" @mouseleave="play">
    <!-- 轮播图主体 （轮播图片）-->
    <ul class="carousel-body">
      <li
        v-for="(item, index) in slides"
        :key="item.id"
        class="carousel-item"
        :class="{ fade: active === index }"
      >
        <RouterLink to="/">
          <img :src="item.imgUrl" alt="" />
        </RouterLink>
      </li>
    </ul>
    <!-- 左侧箭头 -->
    <a href="javascript:;" class="carousel-btn prev" @click="onPrev">
      <i class="iconfont icon-angle-left"></i>
    </a>
    <!-- 右侧箭头 -->
    <a href="javascript:;" class="carousel-btn next" @click="onNext">
      <i class="iconfont icon-angle-right"></i>
    </a>
    <!-- 小圆点 -->
    <div class="carousel-indicator">
      <span
        v-for="(item, index) in slides"
        :key="item.id"
        :class="{ active: active === index }"
        @mouseenter="active = index"
      ></span>
    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>
